EP1388323A1 - Dynamic stabilising arrangement for bones, in particular for the spinal column - Google Patents
- ️Wed Feb 11 2004
EP1388323A1 - Dynamic stabilising arrangement for bones, in particular for the spinal column - Google Patents
Dynamic stabilising arrangement for bones, in particular for the spinal column Download PDFInfo
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Publication number
- EP1388323A1 EP1388323A1 EP03012088A EP03012088A EP1388323A1 EP 1388323 A1 EP1388323 A1 EP 1388323A1 EP 03012088 A EP03012088 A EP 03012088A EP 03012088 A EP03012088 A EP 03012088A EP 1388323 A1 EP1388323 A1 EP 1388323A1 Authority
- EP
- European Patent Office Prior art keywords
- rod
- bone
- bone anchoring
- dynamic
- anchoring elements Prior art date
- 2002-08-09 Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 210000000988 bone and bone Anatomy 0.000 title claims abstract description 42
- 230000003019 stabilising effect Effects 0.000 title 1
- 230000006641 stabilisation Effects 0.000 claims abstract description 9
- 238000011105 stabilization Methods 0.000 claims abstract description 9
- 238000004873 anchoring Methods 0.000 claims abstract 19
- 230000000087 stabilizing effect Effects 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 6
- 238000013016 damping Methods 0.000 description 7
- 230000005540 biological transmission Effects 0.000 description 5
- 239000004033 plastic Substances 0.000 description 4
- 229920003023 plastic Polymers 0.000 description 4
- 230000002950 deficient Effects 0.000 description 3
- 239000003381 stabilizer Substances 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 239000004705 High-molecular-weight polyethylene Substances 0.000 description 1
- 210000003484 anatomy Anatomy 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006735 deficit Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000007943 implant Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000001356 surgical procedure Methods 0.000 description 1
Images
Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws or setting implements
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/70—Spinal positioners or stabilisers, e.g. stabilisers comprising fluid filler in an implant
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws or setting implements
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/70—Spinal positioners or stabilisers, e.g. stabilisers comprising fluid filler in an implant
- A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
- A61B17/7035—Screws or hooks, wherein a rod-clamping part and a bone-anchoring part can pivot relative to each other
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws or setting implements
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/70—Spinal positioners or stabilisers, e.g. stabilisers comprising fluid filler in an implant
- A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
- A61B17/7002—Longitudinal elements, e.g. rods
- A61B17/7004—Longitudinal elements, e.g. rods with a cross-section which varies along its length
- A61B17/7008—Longitudinal elements, e.g. rods with a cross-section which varies along its length with parts of, or attached to, the longitudinal elements, bearing against an outside of the screw or hook heads, e.g. nuts on threaded rods
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws or setting implements
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/70—Spinal positioners or stabilisers, e.g. stabilisers comprising fluid filler in an implant
- A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
- A61B17/7002—Longitudinal elements, e.g. rods
- A61B17/7019—Longitudinal elements having flexible parts, or parts connected together, such that after implantation the elements can move relative to each other
- A61B17/702—Longitudinal elements having flexible parts, or parts connected together, such that after implantation the elements can move relative to each other having a core or insert, and a sleeve, whereby a screw or hook can move along the core or in the sleeve
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws or setting implements
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/70—Spinal positioners or stabilisers, e.g. stabilisers comprising fluid filler in an implant
- A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
- A61B17/7032—Screws or hooks with U-shaped head or back through which longitudinal rods pass
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods
- A61B2017/00831—Material properties
- A61B2017/0084—Material properties low friction
- A61B2017/00845—Material properties low friction of moving parts with respect to each other
Definitions
- the invention relates to a dynamic stabilization device for bones, in particular for vertebrae according to the preamble of claim 1.
- a known method of treatment of disc defects is the surgical removal of the defective disc and the Stiffening of the intervertebral disc space with the two vertebral bodies or after removal of the defective disc the subsequent use of an artificial disc.
- In the first Fall are those adjacent to the stiffened section Sections of the spine are unnaturally charged and in the second case is a simulation of the properties of a natural disc still unsatisfactory.
- EP 0 669 109 B1 discloses a device for stabilizing known from neighboring vertebrae, with a damaged one Intervertebral disc and the intervertebral joints posterior be partially relieved.
- the device has two pedicle screws on top, with one made of an elastic plastic existing band are respectively firmly connected and over the preloaded band joined together.
- For transmission of compressive forces is also a deferred on the elastic band pressure-resistant body between the two screw heads intended.
- the use of such a band gives but no leadership stability of the motion segment of a Spine.
- an adjustment of the adjacent vortex not possible in their positioning relative to each other, because the power transmission behavior of the band and the Pressure element on the bone screws is unspecific.
- EP 0 516 567 B1 discloses a device for stabilization known adjacent eddy, which one of an elastomer existing damping element, the between provided two screwed into the vortex monoaxial screws is.
- the damping element points at his with the screws each end to be connected to a ball head, which can be used in each case a receiving part of the bone screws and is fixable in it.
- a minor one Adjustment of the angle of the bone screw relative to the Longitudinal axis of the damping element possible.
- the power transmission behavior the damping element undefined, as it is not only axial but also gives bending and torsional forces.
- a pedicle screw 1, 2 has a screw element with a threaded shaft 4 with a bone thread and a spherical segment-shaped head 5, which with a receiving part 6 is connected.
- the receiving part 6 has at his one end an axially symmetrically aligned first bore 7, whose diameter is larger than that of the threaded portion of the shaft 4 and smaller than that of the head 5.
- the at the first hole 7 opposite end is open and whose diameter is so large that the screw member through the open end with its threaded section through the first hole 7 through and with the head 5 to the bottom of second bore is feasible.
- the reason of the recording part is formed such that the screw element in the inserted and unloaded state in the receiving part 6 pivotally is.
- the receiving part further has a symmetrical towards the center arranged U-shaped recess on whose base to first hole 7 is directed towards and through the two free Leg 10, 11 are formed. In an area adjacent to the free end, the legs 10, 11 an internal thread 12th on.
- the pedicle screw also includes a pressure element 13, which is formed with a suitable outer diameter so is that it can be inserted into the receiving part 6. At its one end is a to the first hole. 7 the receiving part 6 towards expanding spherical segment-shaped recess 14 provided, the ball radius is chosen so that he in a state inserted into the receiving part the head 5 partially covered by the screw element. Towards the free end of the legs 10, 11, the pressure element 13th a U-shaped recess 15 whose dimensions are so dimensioned are that inserted into the channel formed thereby the rod 3 can be.
- the pressure element 13 In the direction of the cylinder axis of the Shooting part 6 seen depth of the U-shaped recess 15th is larger than the diameter of the male rod 3, so that the pressure element 13 with lateral legs 16 on the inserted rod 3 protrudes upward.
- the pressure element 13 also has a central bore 17 which extends through this extends through to engage a Screwing tool provided with a corresponding in the head 5 Recess 18.
- a between the legs 10, 11 screwed sleeve or mother-like closure element 20 is provided, which a External thread 21 has, with the internal thread 12 of Leg cooperates and which further has an internal thread 22nd having.
- the closure element 20 further at its one end radially extending cuts 23rd on.
- the dimensions of the closure element 20 in the axial Direction of the receiving part, as well as the dimensions of the free Leg 10, 11 of the receiving part and the dimensions of the cooperating Thread or the height of the free legs 16 the pressure element are dimensioned such that the closure element 20 in the screwed state on the legs 16 of the Pressure element exerts a force, so that this the head 5 in blocked the receiving part 6.
- a screwed into the closure element 20 is internal screw or clamping or setting screw 25 is provided, whose External thread 26 with the internal thread 22 of the closure element 20 cooperates.
- the dimensions of the internal screw 25, the closure element 20 and the pressure element 13 are selected that the inner screw 25 in the screwed state on the inserted rod 3 presses.
- Fig. 4 shows a section through the pedicle screw 1 according to Figures 1 and 2.
- the pedicle screw 1 is different from the pedicle screw 2 by the formation of the inner screw.
- the internal screw 25 'of the pedicle screw 1 facing at its the rod Side a sliding bottom 26 made of a sliding material on to a low-friction sliding of the rod during operation enable.
- a sliding material for example, a high molecular weight polyethylene used.
- Stabilization device further comprises a spring element 30, which between the two connected by the rod Pedicle screws 1, 2 is provided.
- the spring element 30 is as a coil spring with a diameter that is slightly larger is, as the diameter of the rod 3, formed so that the coil spring can be pushed onto the rod 3.
- the Length of the coil spring in the axial direction is adapted the magnitude of the with the rod between the two pedicle screws to be bridged distance of the adjacent Whirl. Further, the length of the coil spring and the spring force such that one for a given functional deficit the disc desired extension or compression effect can be achieved with the spring.
- the spring is preferably with an abrasion resistant material e.g. with an abrasion resistant Plastic coated.
- the rod 3 has at its one end a stop 31, e.g. in the form of an annular shoulder, which has a diameter which is larger than the diameter of the U-shaped Recess of the receiving part 6 and the pressure element 13, so that in the assembled state, the stop 31 adjacent pedicle screw 1 is only up to this displaceable.
- Prefers is the rod with a material, especially with a suitable Plastic, coated, a sliding of the rod in the receiving part 6 or in the pressure element provided therein 13 relieved.
- the pressure element 15 at least one of the pedicle screws with a the lubricity enhancing material, e.g. a plastic coated.
- the printing elements 13 are already introduced into the receiving parts.
- the rod 3 is oriented so that the stop 31 points in the direction of the patient's head. Further the spring 30 is precompressed by means of a tool to They under a bias between the two receiving parts 6 to bring.
- FIG. 5 the next step, shown in FIG.
- this acts System as power transmission and damping system.
- the at upright posture of the patient acting on the spine Forces are sometimes transmitted through the pedicle screw system, Transfer spring and rod so that the disc is relieved.
- the spring acts both as an extension element to widen the intervertebral space in resting or unloaded condition, e.g. when lying, as well as a damper for damping shocks under loads, e.g. while walking.
- the system has the advantage that during assembly a optimal adjustment of the bone screws and the rod possible is. Due to the rigid connection over the rod, it is possible to transmit axial forces and thus the disc to relieve. However, the system is resistant to bending and torsion, which is another benefit in terms of one includes precise power transmission to the disc.
- the invention is not limited to the connection of only two polyaxial Pedicle screws limited by a rod. If It may require several vertebrae with each other be connected, in which case a corresponding number of polyaxial bone screws is available. Depending on the desired Agility is an appropriate stop on the Rod provided and the corresponding adjacent bone screw held displaceable relative to the rod.
- polyaxial bone screws used the invention is not limited to this. If it is the anatomy of the corresponding Section on the spine allows monoaxial bone screws can be used, it is also possible according to the invention, a monoaxial bone screw fixedly connected to the rod and one movably connected to the rod Monoaxial bone screw to use. Also combinations from monoaxial bone screws and polyaxial bone screws can be used.
- the spring element 30 can also be designed differently.
- the spring member 30 may be a coil spring be formed, which is provided inside the rod.
- the rod is in two parts of two nested Formed sleeves, each having a sleeve bottom, to which rest the ends of the coil spring.
- the spring element can also be used as an elastic tube made of a polymer be educated.
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- Health & Medical Sciences (AREA)
- Orthopedic Medicine & Surgery (AREA)
- Life Sciences & Earth Sciences (AREA)
- Neurology (AREA)
- Surgery (AREA)
- Heart & Thoracic Surgery (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Medical Informatics (AREA)
- Molecular Biology (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Surgical Instruments (AREA)
- Prostheses (AREA)
Abstract
Dynamic stabilization device for bones, especially vertebra (100, 101), comprises at least one first (1) and one second bone anchoring element (2), each having a first section (4) for anchoring in a bone and a second section for connecting to a rod (3) which connects the two anchoring elements. The bone anchoring elements are fixed to the rod or connected to the rod so that they can be displaced in the direction of the rod axis. An element, which can be elastically pre-tensioned in the direction of the rod axis, is arranged between the bone anchoring elements. Preferred Features: The bone anchoring elements are bone screws or bone hooks. The elastic element is a helical spring (30) surrounding the rod.
Description
Die Erfindung betrifft eine dynamische Stabilisierungseinrichtung für Knochen, insbesondere für Wirbel nach dem Oberbegriff des Patentanspruches 1.The invention relates to a dynamic stabilization device for bones, in particular for vertebrae according to the preamble of claim 1.
Eine bekannte Methode der Behandlung von Bandscheibendefekten ist die operative Entnahme der defekten Bandscheibe und die Versteifung des Bandscheibenzwischenraums mit den beiden Wirbelkörpern oder nach Entnahme der defekten Bandscheibe der anschließende Einsatz einer künstlichen Bandscheibe. Im ersten Fall werden die an den versteiften Abschnitt angrenzenden Abschnitte der Wirbelsäule unnatürlich belastet und im zweiten Fall ist eine Simulierung der Eigenschaften einer natürlichen Bandscheibe noch unbefriedigend.A known method of treatment of disc defects is the surgical removal of the defective disc and the Stiffening of the intervertebral disc space with the two vertebral bodies or after removal of the defective disc the subsequent use of an artificial disc. In the first Fall are those adjacent to the stiffened section Sections of the spine are unnaturally charged and in the second case is a simulation of the properties of a natural disc still unsatisfactory.
Aus der EP 0 669 109 B1 ist eine Vorrichtung zum Stabilisieren von benachbarten Rückenwirbeln bekannt, mit der eine geschädigte Bandscheibe und die Zwischenwirbelgelenke posterior teilentlastet werden können. Die Vorrichtung weist zwei Pedikelschrauben auf, die mit einem aus einem elastischen Kunststoff bestehenden Band jeweils fest verbunden sind und über das vorgespannte Band miteinander verbunden. Zur Übertragung von Druckkräften ist ferner ein auf das elastische Band aufgeschobener druckfester Körper zwischen den zwei Schraubenköpfen vorgesehen. Die Verwendung eines solchen Bandes ergibt jedoch keine Führungsstabilität des Bewegungssegmentes einer Wirbelsäule. Ferner ist eine Justierung der benachbarten Wirbel in ihrer Positionierung relativ zueinander nicht möglich, da das Kraftübertragungsverhalten des Bandes und des Druckelementes über die Knochenschrauben unspezifisch ist.EP 0 669 109 B1 discloses a device for stabilizing known from neighboring vertebrae, with a damaged one Intervertebral disc and the intervertebral joints posterior be partially relieved. The device has two pedicle screws on top, with one made of an elastic plastic existing band are respectively firmly connected and over the preloaded band joined together. For transmission of compressive forces is also a deferred on the elastic band pressure-resistant body between the two screw heads intended. The use of such a band gives but no leadership stability of the motion segment of a Spine. Furthermore, an adjustment of the adjacent vortex not possible in their positioning relative to each other, because the power transmission behavior of the band and the Pressure element on the bone screws is unspecific.
Aus der EP 0 516 567 B1 ist eine Vorrichtung zur Stabilisierung benachbarter Wirbel bekannt, welche ein aus einem Elastomer bestehendes Dämpfungselement aufweist, das zwischen zwei in die Wirbel eingeschraubte Monoaxialschrauben vorgesehen ist. Das Dämpfungselement weist an seinen mit den Schrauben zu verbindenden Enden jeweils einen Kugelkopf auf, welcher in jeweils ein Aufnahmeteil der Knochenschrauben einsetzbar und darin fixierbar ist. Somit ist eine geringfügige Justierung des Winkels der Knochenschraube relativ zu der Längsachse des Dämpfungselementes möglich. Es muß jedoch für jedes miteinander zu verbindende Wirbelpaar ein individuell passendes Dämpfungselement mit exakter Länge und exaktem Querschnitt gefertigt sein. Ferner ist das Kraftübertragungsverhalten des Dämpfungselements undefiniert, da es nicht nur axialen sondern auch Biege- und Torsionskräften nachgibt.EP 0 516 567 B1 discloses a device for stabilization known adjacent eddy, which one of an elastomer existing damping element, the between provided two screwed into the vortex monoaxial screws is. The damping element points at his with the screws each end to be connected to a ball head, which can be used in each case a receiving part of the bone screws and is fixable in it. Thus, a minor one Adjustment of the angle of the bone screw relative to the Longitudinal axis of the damping element possible. However, it must be for each swirl pair to be connected individually matching damping element with exact length and exact Cross section be made. Furthermore, the power transmission behavior the damping element undefined, as it is not only axial but also gives bending and torsional forces.
Es ist ferner bekannt, zur Fixierung der Wirbelsäule bzw. von Abschnitten der Wirbelsäule ein Implantatsystem bestehend aus einem Stab und wenigstens zwei mit dem Stab fest verbundenen Pedikelschrauben, die in entsprechende Wirbel eingeschraubt sind, vorzusehen. Damit ist jedoch keine dynamische Bewegungskontrolle der Bandscheibe oder eine dynamische Lastübernahme zum Entlasten einer Bandscheibe möglich. It is also known to fix the spine or of Sections of the spine comprise an implant system a rod and at least two firmly connected to the rod Pedicle screws screwed into corresponding vertebrae are to be provided. However, this is not a dynamic motion control the disc or a dynamic load transfer to relieve an intervertebral disc possible.
Es ist Aufgabe der Erfindung eine dynamisch wirkende Stabilisierungseinrichtung für Knochen, insbesondere für benachbarte Wirbel bereitzustellen, mit der es sowohl möglich ist, die Knochen bzw. Wirbel und Zwischenwirbelgelenke zueinander zu positionieren und gleichzeitig die dazwischen angebundene Bandscheibe und Zwischenwirbelgelenke hinsichtlich der zu übertragenden Kräfte in definierter Weise zu unterstützen und teilzuentlasten.It is an object of the invention to provide a dynamically acting stabilizing device for bones, especially for neighboring ones Vortex, with which it is both possible, the Bones or vertebrae and intervertebral joints to each other position and at the same time the connected between Intervertebral disc and intervertebral joints with respect to to support transmitted forces in a defined manner and teilzuentlasten.
Die Aufgabe wird gelöst durch eine Stabilisierungseinrichtung gemäß Patentanspruch 1. Weiterbildungen der Erfindung sind in den Unteransprüchen angegeben.The object is achieved by a stabilization device according to claim 1. Further developments of the invention are in specified in the dependent claims.
Weitere Merkmale und Zweckmäßigkeiten ergeben sich aus der Beschreibung von Ausführungsbeispielen anhand der Figuren. Von den Figuren zeigen:
- Fig. 1
- eine schematische Seitenansicht der erfindungsgemäßen Vorrichtung in montiertem Zustand, Fig. 2
- eine Draufsicht auf die erfindungsgemäße Vorrichtung gemäß Fig. 1; Fig. 3
- eine Schnittdarstellung einer in der Vorrichtung verwendeten Polyaxialschraube gemäß der Linie VII in Fig. 1; Fig. 4
- eine teilgeschnittene Darstellung durch die in der Vorrichtung verwendete Polyaxialschraube gemäß Fig. 1 entlang der Linie in Fig. 2; Fig. 5
- eine Darstellung einer Abfolge von Schritten, bis Fig. 8
- die die Montage der Stabilisierungseinrichtung zeigt.
- Fig. 1
- a schematic side view of the device according to the invention in the assembled state, Fig. 2
- a plan view of the inventive device of FIG. 1; Fig. 3
- a sectional view of a polyaxial screw used in the device along the line VII in Fig. 1; Fig. 4
- a partial sectional view through the polyaxial screw used in the apparatus of Figure 1 along the line in Fig. 2. Fig. 5
- a representation of a sequence of steps, to Fig. 8
- showing the assembly of the stabilizer.
Wie insbesondere aus den Fig. 1 bis 4 ersichtlich ist, weist die Stabilisierungseinrichtung zum Stabilisieren zweier benachbarter Wirbel 100, 101 zwei polyaxiale Pedikelschrauben 1, 2 und einen diese verbindenden Stab 3 auf. Die Pedikelschrauben 1, 2 sind bevorzugt wie in Fig. 3 und 4 dargestellt ist, ausgebildet. Eine Pedikelschraube 1, 2 weist ein Schraubenelement mit einem Gewindeschaft 4 mit einem Knochengewinde und einem kugelsegmentförmigen Kopf 5 auf, der mit einem Aufnahmeteil 6 verbunden ist. Das Aufnahmeteil 6 hat an seinem einen Ende eine axialsymmetrisch ausgerichtete erste Bohrung 7, deren Durchmesser größer ist, als der des Gewindeabschnitts des Schafts 4 und kleiner als der des Kopfes 5 ist. Ferner weist es eine koaxiale zweite Bohrung 8 auf, die an dem der ersten Bohrung 7 gegenüberliegendem Ende offen ist und deren Durchmesser so groß ist, daß das Schraubenelement durch das offene Ende mit seinem Gewindeabschnitt durch die erste Bohrung 7 hindurch und mit dem Kopf 5 bis zum Grund der zweiten Bohrung führbar ist. Der Grund des Aufnahmeteils ist derart ausgebildet, daß das Schraubenelement im eingeführten und unbelasteten Zustand in dem Aufnahmeteil 6 schwenkbar ist. Das Aufnahmeteil weist ferner eine zur Mitte hin symmetrisch angeordnete U-förmige Ausnehmung auf, deren Grund zur ersten Bohrung 7 hin gerichtet ist und durch die zwei freie Schenkel 10, 11 gebildet sind. In einem Bereich angrenzend an das freie Ende weisen die Schenkel 10, 11 ein Innengewinde 12 auf.As can be seen in particular from FIGS. 1 to 4, points the stabilizer for stabilizing two adjacent ones Vertebrae 100, 101 two polyaxial pedicle screws 1, 2 and a bar 3 connecting them. The pedicle screws 1, 2 are preferably as shown in FIGS. 3 and 4 is, trained. A pedicle screw 1, 2 has a screw element with a threaded shaft 4 with a bone thread and a spherical segment-shaped head 5, which with a receiving part 6 is connected. The receiving part 6 has at his one end an axially symmetrically aligned first bore 7, whose diameter is larger than that of the threaded portion of the shaft 4 and smaller than that of the head 5. Furthermore, it has a coaxial second bore 8, the at the first hole 7 opposite end is open and whose diameter is so large that the screw member through the open end with its threaded section through the first hole 7 through and with the head 5 to the bottom of second bore is feasible. The reason of the recording part is formed such that the screw element in the inserted and unloaded state in the receiving part 6 pivotally is. The receiving part further has a symmetrical towards the center arranged U-shaped recess on whose base to first hole 7 is directed towards and through the two free Leg 10, 11 are formed. In an area adjacent to the free end, the legs 10, 11 an internal thread 12th on.
Die Pedikelschraube beinhaltet außerdem ein Druckelement 13, welches mit einem geeigneten Außendurchmesser so ausgebildet ist, daß es in das Aufnahmeteil 6 eingeschoben werden kann. An seinem einen Ende ist eine sich zu der ersten Bohrung 7 des Aufnahmeteils 6 hin erweiternde kugelsegmentförmige Ausnehmung 14 vorgesehen, deren Kugelradius so gewählt, daß er in einem in das Aufnahmeteil eingesetzten Zustand den Kopf 5 des Schraubenelements teilweise umfaßt. In Richtung des freien Endes der Schenkel 10, 11 weist das Druckelement 13 eine U-förmige Ausnehmung 15 auf, deren Abmessungen so bemessen sind, daß in den dadurch gebildeten Kanal der Stab 3 eingelegt werden kann. Die in Richtung der Zylinderachse des Aufnahmeteils 6 gesehene Tiefe der U-förmigen Ausnehmung 15 ist größer als der Durchmesser des aufzunehmenden Stabs 3, so daß das Druckelement 13 mit seitlichen Schenkeln 16 über den eingelegten Stab 3 nach oben hervorsteht. Das Druckelement 13 weist ferner eine zentrale Bohrung 17 auf, die sich durch dieses hindurch erstreckt zum Ineingriffbringen eines Schraubwerkzeuges mit einer entsprechenden in dem Kopf 5 vorgesehenen Ausnehmung 18.The pedicle screw also includes a pressure element 13, which is formed with a suitable outer diameter so is that it can be inserted into the receiving part 6. At its one end is a to the first hole. 7 the receiving part 6 towards expanding spherical segment-shaped recess 14 provided, the ball radius is chosen so that he in a state inserted into the receiving part the head 5 partially covered by the screw element. Towards the free end of the legs 10, 11, the pressure element 13th a U-shaped recess 15 whose dimensions are so dimensioned are that inserted into the channel formed thereby the rod 3 can be. In the direction of the cylinder axis of the Shooting part 6 seen depth of the U-shaped recess 15th is larger than the diameter of the male rod 3, so that the pressure element 13 with lateral legs 16 on the inserted rod 3 protrudes upward. The pressure element 13 also has a central bore 17 which extends through this extends through to engage a Screwing tool provided with a corresponding in the head 5 Recess 18.
Zum Fixieren des Schraubenelements in dem Aufnahmeteil ist ein zwischen die Schenkel 10, 11 einschraubbares muffen- bzw. mutterartiges Verschlußelement 20 vorgesehen, welches ein Außengewinde 21 aufweist, das mit dem Innengewinde 12 der Schenkel zusammenwirkt und welches ferner ein Innengewinde 22 aufweist. Zum Einschrauben weist das Verschlußelement 20 ferner an seinem einen Ende radial verlaufende Einschnitte 23 auf. Die Abmessungen des Verschlußelements 20 in axialer Richtung des Aufnahmeteils, sowie die Abmessungen der freien Schenkel 10, 11 des Aufnahmeteils und die Abmessungen der zusammenwirkenden Gewinde bzw. die Höhe der freien Schenkel 16 des Druckelements sind derart bemessen, daß das Verschlußelement 20 in eingeschraubtem Zustand auf die Schenkel 16 des Druckelements eine Kraft ausübt, so daß dieses den Kopf 5 in dem Aufnahmeteil 6 blockiert.To fix the screw member in the receiving part a between the legs 10, 11 screwed sleeve or mother-like closure element 20 is provided, which a External thread 21 has, with the internal thread 12 of Leg cooperates and which further has an internal thread 22nd having. For screwing, the closure element 20 further at its one end radially extending cuts 23rd on. The dimensions of the closure element 20 in the axial Direction of the receiving part, as well as the dimensions of the free Leg 10, 11 of the receiving part and the dimensions of the cooperating Thread or the height of the free legs 16 the pressure element are dimensioned such that the closure element 20 in the screwed state on the legs 16 of the Pressure element exerts a force, so that this the head 5 in blocked the receiving part 6.
Ferner ist eine in das Verschlußelement 20 einschraubbare Innenschraube bzw. Klemm- oder Setzschraube 25 vorgesehen, deren Außengewinde 26 mit dem Innengewinde 22 des Verschlußelements 20 zusammenwirkt. Die Abmessungen der Innenschraube 25, des Verschlußelements 20 und des Druckelements 13 sind so gewählt, daß die Innenschraube 25 in eingeschraubtem Zustand auf den eingelegten Stab 3 drückt.Further, a screwed into the closure element 20 is internal screw or clamping or setting screw 25 is provided, whose External thread 26 with the internal thread 22 of the closure element 20 cooperates. The dimensions of the internal screw 25, the closure element 20 and the pressure element 13 are selected that the inner screw 25 in the screwed state on the inserted rod 3 presses.
In Fig. 4 zeigt einen Schnitt durch die Pedikelschraube 1 gemäß den Figuren 1 und 2. Die Pedikelschraube 1 unterscheidet sich von der Pedikelschraube 2 durch die Ausbildung der Innenschraube. Wie aus Fig. 4 ersichtlich ist, weist die Innenschraube 25' der Pedikelschraube 1 an ihrer dem Stab zugewandten Seite einen Gleitboden 26 aus einem Gleitmaterial auf, um im Betrieb ein reibungsarmes Gleiten des Stabes zu ermöglichen. Als Gleitmaterial wird beispielsweise ein hochmolekulares Polyethylen eingesetzt.In Fig. 4 shows a section through the pedicle screw 1 according to Figures 1 and 2. The pedicle screw 1 is different from the pedicle screw 2 by the formation of the inner screw. As can be seen from Fig. 4, the internal screw 25 'of the pedicle screw 1 facing at its the rod Side a sliding bottom 26 made of a sliding material on to a low-friction sliding of the rod during operation enable. As a sliding material, for example, a high molecular weight polyethylene used.
Wie aus den Figuren 1 und 2 ersichtlich ist, beinhaltet die Stabilisierungseinrichtung ferner ein Federelement 30, welches zwischen den zwei über den Stab miteinander verbundenen Pedikelschrauben 1, 2 vorgesehen ist. Das Federelement 30 ist als eine Schraubenfeder mit einem Durchmesser, der etwas größer ist, als der Durchmesser des Stabes 3, ausgebildet, so daß die Schraubenfeder auf den Stab 3 aufschiebbar ist. Die Länge der Schraubenfeder in axialer Richtung ist angepaßt an die Größenordnung des mit dem Stab zwischen den zwei Pedikelschrauben zu überbrückenden Abstandes der benachbarten Wirbel. Ferner ist die Länge der Schraubenfeder und die Federkraft so bemessen, daß eine für ein vorliegendes Funktionsdefizit der Bandscheibe gewünschte Extensions- bzw. Kompressionswirkung mit der Feder erzielbar ist. Die Feder ist bevorzugt mit einem abriebfesten Material z.B. mit einem abriebfesten Kunststoff beschichtet.As can be seen from Figures 1 and 2, includes Stabilization device further comprises a spring element 30, which between the two connected by the rod Pedicle screws 1, 2 is provided. The spring element 30 is as a coil spring with a diameter that is slightly larger is, as the diameter of the rod 3, formed so that the coil spring can be pushed onto the rod 3. The Length of the coil spring in the axial direction is adapted the magnitude of the with the rod between the two pedicle screws to be bridged distance of the adjacent Whirl. Further, the length of the coil spring and the spring force such that one for a given functional deficit the disc desired extension or compression effect can be achieved with the spring. The spring is preferably with an abrasion resistant material e.g. with an abrasion resistant Plastic coated.
Der Stab 3 weist an seinem einen Ende einen Anschlag 31, z.B. in Form einer ringförmigen Schulter auf, die einen Durchmesser hat, der größer ist, als der Durchmesser der U-förmigen Ausnehmung des Aufnahmeteils 6 und des Druckelements 13, so daß in montiertem Zustand die dem Anschlag 31 benachbarte Pedikelschraube 1 nur bis zu diesem verschiebbar ist. Bevorzugt ist der Stab mit einem Material, insbesondere mit einem geeigneten Kunststoff, beschichtet, das ein Gleiten des Stabes in dem Aufnahmeteil 6 bzw. in dem darin vorgesehenen Druckelement 13 erleichtert. Bevorzugt ist ferner auch das Druckelement 15 wenigstens einer der Pedikelschrauben mit einem die Gleitfähigkeit erhöhenden Material, z.B. einem Kunststoff beschichtet.The rod 3 has at its one end a stop 31, e.g. in the form of an annular shoulder, which has a diameter which is larger than the diameter of the U-shaped Recess of the receiving part 6 and the pressure element 13, so that in the assembled state, the stop 31 adjacent pedicle screw 1 is only up to this displaceable. Prefers is the rod with a material, especially with a suitable Plastic, coated, a sliding of the rod in the receiving part 6 or in the pressure element provided therein 13 relieved. Also preferred is also the pressure element 15 at least one of the pedicle screws with a the lubricity enhancing material, e.g. a plastic coated.
Im Betrieb werden, wie in Fig. 5 ersichtlich ist, zuerst die in die Aufnahmeteile 6 eingesetzten Schraubenelemente der Pedikelschrauben 1, 2 durch den Chirurgen in die einer defekten Bandscheibe 200 benachbarten Wirbel eines Patienten im entlasteten Zustand eingeschraubt und die Aufnahmeteile 6 so ausgerichtet, daß der Stab 3 einsetzbar ist. Die Druckelemente 13 sind bereits in die Aufnahmeteile eingeführt. Als nächstes wird, wie in Fig. 6 gezeigt ist, der Stab 3 mit der auf diesen aufgeschobenen Feder 30 in die Aufnahmeteile 6 eingesetzt. Der Stab 3 wird dabei so orientiert, daß der Anschlag 31 in Richtung des Kopfes des Patienten zeigt. Ferner wird die Feder 30 mittels eines Werkzeuges vorkomprimiert, um sie unter einer Vorspannung zwischen die beiden Aufnahmeteile 6 einzubringen. Im nächsten Schritt, der in Fig. 7 dargestellt ist, stellt der Chirurg die optimale Winkelstellung von Schraubenelement zu Aufnahmeteil bzw. Stab für jede der Pedikelschrauben 1, 2 ein. Diese Winkelstellung wird anschließend durch Einschrauben der Verschlußelemente 20 in die Aufnahmeteile fixiert. Wie aus Fig. 3 und 4 ersichtlich ist, erfolgt die Blockierung der Winkelstellung dadurch, daß das Verschlußelement 20 eine Kraft so auf das Druckelement 13 ausübt, daß dieses den Kopf 5 in dem Aufnahmeteil in seiner Stellung fixiert. Da die Schenkel 16 des Druckelements über den eingelegten Stab 3 hinaus hervorstehen, wird durch das Einschrauben des Verschlußelementes 20 der Stab 3 nicht berührt und ist in dem Aufnahmeteil 6 jeweils noch frei verschiebbar.In operation, as shown in Fig. 5, the first inserted into the receiving parts 6 screw elements of the pedicle screws 1, 2 by the surgeon into the one defective Intervertebral disc 200 relieved in a patient's adjacent vertebra State screwed in and the receiving parts 6 so aligned so that the rod 3 can be used. The printing elements 13 are already introduced into the receiving parts. When Next, as shown in Fig. 6, the rod 3 with the on this deferred spring 30 in the receiving parts. 6 used. The rod 3 is oriented so that the stop 31 points in the direction of the patient's head. Further the spring 30 is precompressed by means of a tool to They under a bias between the two receiving parts 6 to bring. In the next step, shown in FIG. 7 is shown, the surgeon provides the optimal angular position from screw element to receiving part or rod for each the pedicle screws 1, 2 a. This angular position will follow by screwing the closure elements 20 in the Fixed receiving parts. As is apparent from FIGS. 3 and 4, the blocking of the angular position takes place in that the Closure element 20 a force so on the pressure element thirteenth exerts that this the head 5 in the receiving part in his Fixed position. Since the legs 16 of the pressure element over protrude the inserted rod 3 addition, is by the Screwing the closure element 20 of the rod 3 is not touched and is still freely displaceable in the receiving part 6.
Durch die Winkeleinstellung von Schraubenelement und Aufnahmeteil zueinander läßt sich ein gewünschter Keilwinkel zwischen den einander gegenüberliegenden Oberflächen der benachbarten Wirbel einstellen, um es der dazwischen befindlichen Bandscheibe zu ermöglichen, ihre natürliche Form wieder anzunehmen. Durch Verwendung von je zwei Stabilisierungseinrichtungen wie in Fig. 2 gezeigt ist, ist dabei die Einstellung des Winkels in seitlicher und frontaler Sicht unabhängig voneinander möglich. Damit kann auch die Position der Zwischenwirbelgelenke zueinander bestimmt werden.Due to the angle adjustment of screw element and receiving part to each other can be a desired wedge angle between the opposite surfaces of the adjacent Adjust swirl to keep it in between To enable intervertebral discs to resume their natural shape. By using two stabilizers each As shown in Fig. 2, is the setting of the angle in lateral and frontal view independently possible. This also allows the position of the intervertebral joints be determined to each other.
Wie ferner aus Fig. 7 ersichtlich ist, expandiert die unter Vorspannung eingesetzte Feder 30 nach dem Einsetzen und drückt somit die Aufnahmeteile 6 auseinander. Auf einer Seite wird die Expansion durch den Anschlag 31 begrenzt. Durch die Expansion erfolgt eine Aufweitung des Zwischenwirbelraumes und der Zwischenwirbelgelenke, wodurch die Bandscheibe 200 durch Aufnahme von Flüssigkeit aus dem Zwischenwirbelraum sich ausdehnen kann und die Zwischenwirbelgelenke entlastet werden, was durch die Pfeile in Fig. 7 veranschaulicht ist. Somit kann eine beschädigte Bandscheibe ihre natürliche Form teilweise wieder annehmen.As further seen in Fig. 7, the lower expands Bias inserted spring 30 after insertion and thus pushes the receiving parts 6 apart. On one side the expansion is limited by the stop 31. By the Expansion occurs an expansion of the intervertebral space and the intervertebral joints, whereby the intervertebral disc 200 by taking fluid from the intervertebral space can expand and relieve the inter-vertebral joints which is illustrated by the arrows in FIG. 7. Thus, a damaged disc can its natural shape partially accept again.
Wie in Fig. 8 gezeigt ist, wird anschließend die Feder durch Aufeinanderzubewegen der Aufnahmeteile 6 etwas komprimiert um sie wieder unter Vorspannung zu bringen. Dadurch verkleinert sich auch der Zwischenwirbelraum und die Bandscheibe wird wieder etwas zusammengedrückt bzw. verkürzt und die Zwischenwirbelgelenke werden belastet, was durch die Pfeile in Fig. 8 dargestellt ist. In der gewünschten Endstellung wird schließlich der Stab 3 mit dem Aufnahmeteil 6 derjenigen Pedikelschraube fest verbunden, die an dem dem Anschlag gegenüberliegenden Ende des Stabes 3 positioniert ist. Die Stabfixierung erfolgt durch Einschrauben der Innenschraube 25. Bei der angrenzend an den Anschlag 31 des Stabes vorgesehenen Pedikelschraube 1 bleiben das Aufnahmeteil 6 und der Stab 3 zueinander beweglich. Die Innenschraube 25' mit dem Gleitboden 26' ermöglicht ein reibungsarmes Gleiten des Stabes.As shown in Fig. 8, then the spring is through To move toward each other of the receiving parts 6 slightly compressed order to bring them back under tension. As a result, downsized also the intervertebral space and the intervertebral disc become again slightly compressed or shortened and the intervertebral joints are loaded, which is indicated by the arrows in Fig. 8 is shown. In the desired end position will eventually the rod 3 with the receiving part 6 of that pedicle screw firmly connected to the opposite of the stop End of the rod 3 is positioned. The rod fixation by screwing in the internal screw 25. In the adjacent to the stop 31 of the rod provided pedicle screw 1 remain the receiving part 6 and the rod 3 to each other movable. The internal screw 25 'with the sliding bottom 26 'allows a low-friction sliding of the rod.
In der in den Fig. 1 und 2 gezeigten Endstellung wirkt das System als Kraftübertragungs- und Dämpfungssystem. Die bei aufrechter Haltung des Patienten auf die Wirbelsäule einwirkenden Kräfte werden zum Teil über das System aus Pedikelschrauben, Feder und Stab übertragen, so daß die Bandscheibe entlastet wird. Ferner wirkt die Feder sowohl als Extensionselement zum Aufweiten des Zwischenwirbelraums im Ruhe- bzw. entlasteten Zustand, z.B. beim Liegen, als auch als Dämpfer zum Dämpfen von Stößen bei Belastungen, wie z.B. beim Gehen.In the end position shown in FIGS. 1 and 2, this acts System as power transmission and damping system. The at upright posture of the patient acting on the spine Forces are sometimes transmitted through the pedicle screw system, Transfer spring and rod so that the disc is relieved. Furthermore, the spring acts both as an extension element to widen the intervertebral space in resting or unloaded condition, e.g. when lying, as well as a damper for damping shocks under loads, e.g. while walking.
Das System weist den Vorteil auf, daß bei der Montage eine optimale Justierung der Knochenschrauben und des Stabes möglich ist. Durch die steife Verbindung über den Stab ist es möglich, axiale Kräfte zu übertragen und somit die Bandscheibe zu entlasten. Das System ist jedoch biege- und torsionssteif, was einen weiteren Vorteil im Hinblick auf eine präzise Kraftübertragung auf die Bandscheibe beinhaltet.The system has the advantage that during assembly a optimal adjustment of the bone screws and the rod possible is. Due to the rigid connection over the rod, it is possible to transmit axial forces and thus the disc to relieve. However, the system is resistant to bending and torsion, which is another benefit in terms of one includes precise power transmission to the disc.
Die Erfindung ist nicht auf die Verbindung von nur zwei polyaxialen Pedikelschrauben durch einen Stab beschränkt. Wenn es erforderlich ist, können auch mehrere Wirbel miteinander verbunden sein, wobei dann eine entsprechende Anzahl von Polyaxial-Knochenschrauben vorhanden ist. Je nach gewünschter Beweglichkeit ist an geeigneter Stelle ein Anschlag auf dem Stab vorgesehen und die entsprechende angrenzende Knochenschraube relativ zum Stab verschiebbar gehalten.The invention is not limited to the connection of only two polyaxial Pedicle screws limited by a rod. If It may require several vertebrae with each other be connected, in which case a corresponding number of polyaxial bone screws is available. Depending on the desired Agility is an appropriate stop on the Rod provided and the corresponding adjacent bone screw held displaceable relative to the rod.
Obwohl in dem beschriebenen Ausführungsbeispiel Polyaxial-Knochenschrauben verwendet werden, ist die Erfindung nicht darauf beschränkt. Wenn es die Anatomie des entsprechenden Abschnittes auf der Wirbelsäule zuläßt, daß Monoaxial-Knochenschrauben verwendet werden können, ist es auch möglich, gemäß der Erfindung eine fest mit dem Stab verbundene Monoaxial-Knochenschraube und eine mit dem Stab beweglich verbundene Monoaxial-Knochenschraube zu verwenden. Auch Kombinationen aus Monoaxial-Knochenschrauben und Polyaxial-Knochenschrauben können verwendet werden.Although in the described embodiment, polyaxial bone screws used, the invention is not limited to this. If it is the anatomy of the corresponding Section on the spine allows monoaxial bone screws can be used, it is also possible According to the invention, a monoaxial bone screw fixedly connected to the rod and one movably connected to the rod Monoaxial bone screw to use. Also combinations from monoaxial bone screws and polyaxial bone screws can be used.
Das Federelement 30 kann auch anders ausgebildet sein. Beispielsweise kann das Federelement 30 als eine Schraubenfeder ausgebildet sein, die im Inneren des Stabes vorgesehen ist. Hierzu ist der Stab zweiteilig aus zwei ineinandergesteckten Hülsen gebildet, die jeweils einen Hülsenboden aufweisen, an dem die Enden der Schraubenfeder anliegen. Das Federelement kann ferner auch als ein elastisches Rohr aus einem Polymer ausgebildet sein.The spring element 30 can also be designed differently. For example For example, the spring member 30 may be a coil spring be formed, which is provided inside the rod. For this purpose, the rod is in two parts of two nested Formed sleeves, each having a sleeve bottom, to which rest the ends of the coil spring. The spring element can also be used as an elastic tube made of a polymer be educated.
Claims (11)
Dynamische Stabilisierungseinrichtung für Knochen, insbesondere
für Wirbel,
mit wenigstens einem ersten (1) und einem zweiten (2) Knochenverankerungselement,
mit jeweils einem ersten, in einem
Knochen zu verankernden Abschnitt (4) und einem zweiten, mit
einem Stab (3) zu verbindenden Abschnitt (6), und
einem die Knochenverankerungselemente (1, 2) verbindenden
Stab (3),
wobei die Knochenverankerungselemente mit dem Stab wahlweise
fest oder in Richtung der Stabachse verschiebbar verbindbar
sind,
gekennzeichnet durch
ein zwischen den Knochenverankerungselementen (1, 2) angeordnetes,
in Richtung der Stabachse elastisch vorspannbares Element
(30).Dynamic stabilization device for bones, in particular for vertebrae,
with at least a first (1) and a second (2) bone anchoring element, each with a first section (4) to be anchored in a bone and a second section (6) to be connected to a rod (3), and one the bone anchoring elements (1, 2) connecting rod (3),
wherein the bone anchoring elements with the rod are selectively fixed or slidably connectable in the direction of the rod axis,
marked by
a between the bone anchoring elements (1, 2) arranged in the direction of the rod axis elastically vorspannbares element (30).
Dynamische Stabilisierungseinrichtung nach Anspruch 1,
dadurch gekennzeichnet, daß eines der Knochenverankerungselemente
(1) mit dem Stab verschiebbar verbunden ist und daß
ein Anschlag (31) zur Begrenzung der Bewegung des verschiebbaren
Knochenverankerungselementes vorgesehen ist.Dynamic stabilization device according to claim 1, characterized in that one of the bone anchoring elements (1) is slidably connected to the rod and that a stop (31) is provided for limiting the movement of the displaceable bone anchoring element.
Dynamische Stabilisierungseinrichtung nach Anspruch 1
oder 2, dadurch gekennzeichnet, daß wenigstens ein Knochenverankerungselement
(1, 2) mit dem Stab (3) polyaxial verbindbar
ist.Dynamic stabilizing device according to claim 1 or 2, characterized in that at least one bone anchoring element (1, 2) can be connected to the rod (3) in a polyaxial manner.
Dynamische Stabilisierungseinrichtung nach Anspruch 3,
dadurch gekennzeichnet, daß das Knochenverankerungselement
einen Schaft (4) zum Verankern im Knochen und ein mit dem
Schaft gelenkig verbundenes Aufnahmeteil (6) zur Aufnahme des
Stabes aufweist, und daß der Schaft (4) und das Aufnahmeteil
(6) relativ zueinander in ihrer Winkelstellung unabhängig von
einer Fixierung des Stabes fixierbar sind.Dynamic stabilization device according to Claim 3, characterized in that the bone anchoring element has a shaft (4) for anchoring in the bone and a receiving part (6) connected to the shaft for receiving the rod, and in that the shaft (4) and the receiving part (6 ) are fixed relative to each other in their angular position independently of a fixation of the rod.
Dynamische Stabilisierungseinrichtung nach Anspruch 4,
dadurch gekennzeichnet, daß das polyaxiale Knochenverankerungselement
(1) mit dem Stab verschiebbar verbunden und dem
Anschlag benachbart angeordnet ist.Dynamic stabilization device according to claim 4, characterized in that the polyaxial bone anchoring element (1) is slidably connected to the rod and arranged adjacent to the stop.
Dynamische Stabilisierungseinrichtung nach einem der Ansprüche
1 bis 5, dadurch gekennzeichnet, daß eines der Knochenverankerungselemente
(2) fest mit dem Stab (3) verbunden
ist.Dynamic stabilizing device according to one of claims 1 to 5, characterized in that one of the bone anchoring elements (2) is firmly connected to the rod (3).
Dynamische Stabilisierungseinrichtung nach einem der Ansprüche
1 bis 6, dadurch gekennzeichnet, daß der Stab (3)
und/oder Teile eines der Knochenverankerungselemente (1, 2)
mit einem Gleitmaterial beschichtet ist.Dynamic stabilizing device according to one of claims 1 to 6, characterized in that the rod (3) and / or parts of one of the bone anchoring elements (1, 2) is coated with a sliding material.
Dynamische Stabilisierungseinrichtung nach einem der Ansprüche
1 bis 7, dadurch gekennzeichnet, daß das elastische
Element (30) als Feder ausgebildet ist.Dynamic stabilizing device according to one of claims 1 to 7, characterized in that the elastic element (30) is designed as a spring.
Dynamische Stabilisierungseinrichtung nach Anspruch 8,
dadurch gekennzeichnet, daß die Feder (30) als eine den Stab
umschließende Schraubenfeder ausgebildet ist.Dynamic stabilizing device according to claim 8, characterized in that the spring (30) is designed as a helical spring enclosing the rod.
Dynamische Stabilisierungseinrichtung nach Anspruch 8,
dadurch gekennzeichnet, daß der Stab (3) zweiteilig und hülsenförmig
ausgebildet ist, und daß die Feder im Stabinneren
vorgesehen ist. Dynamic stabilizing device according to claim 8, characterized in that the rod (3) is formed in two parts and sleeve-shaped, and that the spring is provided in the rod interior.
Dynamische Stabilisierungseinrichtung nach einem der Ansprüche
1 bis 10, dadurch gekennzeichnet, daß die Knochenverankerungselemente
als Knochenschrauben oder Knochenhaken
ausgebildet sind.Dynamic stabilizing device according to one of claims 1 to 10, characterized in that the bone anchoring elements are designed as bone screws or bone hooks.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10236691 | 2002-08-09 | ||
DE10236691A DE10236691B4 (en) | 2002-08-09 | 2002-08-09 | Dynamic stabilization device for bones, in particular for vertebrae |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1388323A1 true EP1388323A1 (en) | 2004-02-11 |
EP1388323B1 EP1388323B1 (en) | 2007-01-10 |
Family
ID=30128808
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03012088A Expired - Lifetime EP1388323B1 (en) | 2002-08-09 | 2003-05-28 | Dynamic stabilising arrangement for bones, in particular for the spinal column |
Country Status (5)
Country | Link |
---|---|
US (2) | US7722649B2 (en) |
EP (1) | EP1388323B1 (en) |
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Also Published As
Publication number | Publication date |
---|---|
KR100780852B1 (en) | 2007-11-29 |
EP1388323B1 (en) | 2007-01-10 |
DE10236691B4 (en) | 2005-12-01 |
JP4547135B2 (en) | 2010-09-22 |
US7722649B2 (en) | 2010-05-25 |
US20040049190A1 (en) | 2004-03-11 |
KR20040014202A (en) | 2004-02-14 |
DE50306246D1 (en) | 2007-02-22 |
JP2004073855A (en) | 2004-03-11 |
DE10236691A1 (en) | 2004-02-26 |
US20100204736A1 (en) | 2010-08-12 |
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